Regenerative heat exchanger

ABSTRACT

A heat exchanger comprises a cylindrical body having closed ends with means in one end for introducing the products of combustion thereinto and venting the same therefrom. The introduction is by means of a directional nozzle positioned axially of the cylindrical body. A tubular baffle is positioned axially of the cylindrical body in spaced relation to the directional nozzle and the cylindrical body so that the action of the jet-like introduction of the products of combustion into the tubular baffle will recirculate gases from within the cylindrical body in a regenerative effect so as maintain an even temperature on the surface of the cylindrical body which is emerged in a tank of liquid to be heated.

[4 1 Dec. 4, 1973 REGENERATIVE HEAT EXCHANGER [75] Inventor: John H.Miller, Youngstown, Ohio [73] Assignee: Hy-Way Heat Systems, Inc.,

Youngstown, Ohio [22] Filed: May 5, 1972 [21] Appl. No.: 250,796

3 ,68 l ,5 66 8/ 1 972 Sellers 126/343 .5

Primary Examiner-Kenneth W. Sprague AttorneyWebster B. Harpman [57]ABSTRACT A heat exchanger comprises a cylindrical body having closedends with means in one end for introducing the products of combustionthereinto and venting the [52] U.S. Cl. 122/33, 122/136 same therefromThe introduction is by means of a [51] f F22! 7/00 rectional nozzlepositioned axially of the cylindrical Fleld of Search body. A tubularbaffle i p i i axially of the y 431/1 16; 126/3435 360 R lindrical bodyin spaced relation to the directional nozzle and the cylindrical body sothat the action of [56] References C'ted the jet-like introduction ofthe products of combustion UNITED STATES PATENTS into the tubular bafflewill recirculate gases from 3,349,754 10/1967 Bock .Q 122/136 X Withinthe cylindrical body in a regenerative effect so 3,685,977 8/1972Goodman 431/116 X as maintain an even temperature on the surface of the3,171,338 3/1965 Ganz 122/149 cylindrical body which is emerged in atankof liquid 2,794,426 6/1957 Lowery. 122/136 to be heated, I 3,269,4488/1966 Martin 431/116 2,717,580 9/1955 Maher 122/136 X 5 Claims, 2Drawing Figures REGENERATIVE HEAT EXCHANGER BACKGROUND OF THEINVENTION 1. Field of the Invention This invention relates to heatexchangers of the direct fire type and capable of emersion in a tank ofliquid to be heated such as a heating oil or an asphalt or the like.

2. Description of the Prior Art Prior structures of this type haveemployed tank-like or tubular constructions into which the products ofcombustion are introduced with-the tank-like or tubular members beingemersed or partly emersed in a tank of fluid to be heated and in orderto avoidthe creation of undesirably high surface temperatures, effortshave been made to baffle the products of combustion with respect to thesurface of the heat exchanger. (See for example US. Pat. Nos. 3,266,485?3,194,229, 3,503,382 and 3,319,709.)

This invention provides a substantially improved result by creating acirculation of the products of combustion within the heat exchanger soas to maintain an even surface temperature and thereby avoid coking ofoil or asphalt materials in which the heat exchanger is emersed.

SUMMARY OF THE INVENTION A heat exchanger, particularly suitable forheating oil for subsequent circulation to other heat exchangers or forheating asphalt so as to maintain the same at a desired fluidtemperature consists of a cylindrical body with means in one end fordirecting the products of combustion as from an oil burner axially ofthe cylindrical body in a jet-like configuration and the positioning ofa tubular baffle in spaced relation to the cylindrical body and inspaced relation to the directional nozzle for receiving the jetlikeconfiguration of the products of combustion whereby recirculation of thegases within the cylindrical body is achieved which results in an evensurface temperature over the entire cylindrical body making itparticularly suitable for emersion heating in a tank of oil or asphaltor the like.

DESCRIPTION or THE DRAWINGS FIG. 1 is a cross sectional side elevationwith parts broken away illustrating the heat exchanger and itspositioningin a tank of fluid to be heated.

FIG. 2 is a vertical section on line 2-2 of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT In its simplest form the heatexchanger of this inventioncomprises an elongated cylindrical bodymember 10*having a closed end 11 and an apertured end 12. The aperturedend 12 provides for the communication of anoil burner 13 and adirectional nozzle 14 located larbaffle 16 with respect to thecylindrical body 10 and it -willbe observed that ,the open end 18 of thetubular baffle '16 is spaced with-respect to the closed end 11 of thecylindricalbody and that the tubular baffle 16 is provided with aplurality of perforations 20 inwardly from theopen end 18;" v

Stillreferrin'g to FIG: 1 of the drawings it will be seen that thecylindrical body 10 is positioned within a tank 21 and that a vent 22extends through the tank 21 and into the cylindrical body 10 adjacentthe apertured end 12 thereof. In FIG. 1 of the drawings theconfiguration where they are directed in the opposite direction towardthe vent 22 the gaseous products of combustion" will also flow out ofthe perforations 20 and thus reduce theend pressure at thispointand'provide for a more desirable rate of flow of the combustiongases in the end of the heat exchanger adjacent the closed end 11.

Further directional arrows in FIG. 1 of the drawings will show that someof the recirculating gases moving toward the vent 22 are drawn .into theopen end 17 of the tubular baffle 16 by the jet-like actionof theproducts of combustion.

By referring now toFIG. 2 of the drawings it will be I seen that theaxialposi't'ioningof the tubular baffle 17 is such that the spacebetween the'same and the cylindrical body 10 of the heat exchangercreates a realtively larger retumpassageway thereabout with theresultant slowing down of the flow of the combustion gases andcontributes to the even surface temperature realized longitudinally ofthe device from the apertured end 12 to the closed end 11 of thecylindrical body thereof.

Although but one embodiment of the present invention has beenillustratedand described it will be apparent to those "skilled in the art thatvarious changes and modifications may be made therein without departingfrom the spirit of the invention.

I claim:

1. A direct fired heat exchanger for location in a tank of material tobe heated and comprising an elongated body member having an aperturedend and a closed end, a directional nozzle positioned in the aperturedend in communication with said aperture arranged to receive products ofcombustion introduced into said heat exchanger through said aperture, atubular baffle positioned in said body member on a common center linewith said directional nozzle and'in spaced relation thereto said tubularbaffle being relatively smaller than said body member andterminating'inwardly from" the closed end thereof and means for ventingthe products of combustion from said body member said means beingpositioned adjacent said apertured end of said elongated body member.

2. The heat exchanger of claim 1 and wherein a discharge orifice in saiddirectional nozzle is of smaller size than said tubular bafi'le wherebya jet-like configuration of the products of combustion directed by saidnozzle may be realized.

4. The heat exchanger set forth in claim 1 and.

wherein the closed end of said elongated body member is arcuate in crosssectional configuration 5. The heat exchanger set forth in claii'n1andwherein the elongated member is cylindrical and the tubular baffle iscross 'sectionally circular and the area between the cylindrical bodymember and the tubular baffle is greater than the diameter of thetubular

1. A direct fired heat exchanger for location in a tank of material tobe heated and comprising an elongated body member having an aperturedend and a closed end, a directional nozzle positioned in the aperturedend in communication with said aperture arranged to receive products ofcombustion introduced into said heat exchanger through said aperture, atubular baffle positioned in said body member on a common center linewith said directional nozzle and in spaced relation thereto said tubularbaffle being relatively smaller than said body member and terminatinginwardly from the closed end thereof and means for venting the productsof combustion from said body member said means being positioned adjacentsaid apertured end of said elongated body member.
 2. The heat exchangerof claim 1 and wherein a discharge orifice in said directional nozzle isof smaller size than said tubular baffle whereby a jet-likeconfiguration of the products of combustion directed by said nozzle maybe realized.
 3. The heat exchanger of claim 1 and wherein said tubularbaffle is perforated inwardly from the end thereof oppositely disposedwith respect to said directional nozzle.
 4. The heat exchanger set forthin claim 1 and wherein the closed end of said eLongated body member isarcuate in cross sectional configuration.
 5. The heat exchanger setforth in claim 1 and wherein the elongated body member is cylindricaland the tubular baffle is cross sectionally circular and the areabetween the cylindrical body member and the tubular baffle is greaterthan the diameter of the tubular baffle.